how to calculate the correlation coefficient of two data sets ( containing dates) ?

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Amr Hashem
Amr Hashem il 16 Set 2015
Risposto: the cyclist il 16 Set 2015
I have to column arrays which containing dates...
I want to calculate the correlation coefficient between column A and column B
I use this code :
but it didn't work. it seems that i have first to convert dates to numbers
any idea on how i could calculate the correlation coefficient between A & B ?

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the cyclist
the cyclist il 16 Set 2015
You can use the datenum command to convert dates to numeric.

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